Time may fix it but you also might need to do this on each listing:
1. Copy the item number from a problem listing.
2. Go to the bottom of the screen, click on Site Map, click on "Change Your Item's Gallery Image"
3. Paste in item number, click continue. If it doesn't appear, click back, enter again, then continue. Basically repeat this process until it appears. Never taken me more than 3 times.
It is a complete pain. Probably could call Ebay if the problem keeps occuring. But for 10 or 20 listing you will spend more time on hold than just following the above steps.